Finding the Third Proportional to 12,739 and 25,821

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739 : 25,821 = 25,821 : x
2. Step 2: Convert to fraction form
   12,739/25,821 = 25,821/x
3. Step 3: Cross multiply
   12,739x = 25,821 × 25,821
4. Step 4: Simplify right side
   12,739x = 666,724,041
5. Step 5: Solve for x
   x = 666,724,041/12,739
6. Step 6: Final answer
   x = 52,337.24